This week’s QuickFire Challenge was to use junk food as an inspiration for a fine dining dish. The chefs each picked one ingredient. As in weeks before, several chefs were undone by their own ambition. (Don’t they watch the show?) Although they only had 45 minutes, Chef Patterson, who had chosen hot dogs, set out to make a homemade sausage in a prosciutto tomato stew. It was barely cooked when it was sent for tasting.